Assets are not discoverable after re-adding Feature Pack to project

.uasset files that were deleted then re-added to the Content Browser are not properly discovered and added to the explorer. I have confirmed these assets are still on disk within Windows Explorer. The only workaround I've found is to restart the editor or reloading the project.

This occurs in //UE4/Release-4.24 cl 11590231 so I am not marking this as a regression.

1. Open a blank BP project with no starter content
2. From the content browser select Add New > Add Feature or Content Pack... > Third Person > + Add to Project
   • Third person feature pack is added to the project
3. Navigate to the Content folder
4. Select and delete these folders: Geometry, Mannequin, ThirdPerson, ThirdPersonBP
5. Repeat steps 2-3
6. Navigate down into one of the added folders

Result
None of the .uasset files are discovered, the feature pack folders are empty

Expected
Added feature pack content is discoverable

Workaround
Reload the project and the assets will be visible in the content browser